Proposal static type constraints features

[Isiah Meadows]

How this this syntax more useful than one derived from TS/Flow, like `x: Foo`?
-----

Isiah Meadows
me at isiahmeadows.com
www.isiahmeadows.com


On Sun, Jun 3, 2018 at 11:48 AM, YU HengChun <achun.shx at qq.com> wrote:
> Update
>
>
> ## Compatibility
>
> For safety, it may be a good idea to use it with default values.
>
> ```js
> let
>   isUndefined = void Number,
>     // Static type constraint does not take effect
>   isNumberUndefined = void(Number)|undefined;
>     // Static type constraint take effect
>
> ```
>
> ## Pending
>
> I'm not sure if it is necessary to support multiple levels of nesting
>
> ```js
> class ConfigType {
>   constructor() {
>     void {
>       version: Number,
>       encodeNames: Boolean,
>       lines: [String],
>       filename: String,
>       linker: undefined | {       // Need support?
>         statics: { [String]: Number },
>       }
>     };
>   }
> }
> ```
>
>
>
> _______________________________________________
> es-discuss mailing list
> es-discuss at mozilla.org
> https://mail.mozilla.org/listinfo/es-discuss